JP2008089094A - Conduit liquefaction measure structure - Google Patents

Conduit liquefaction measure structure Download PDF

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JP2008089094A
JP2008089094A JP2006271343A JP2006271343A JP2008089094A JP 2008089094 A JP2008089094 A JP 2008089094A JP 2006271343 A JP2006271343 A JP 2006271343A JP 2006271343 A JP2006271343 A JP 2006271343A JP 2008089094 A JP2008089094 A JP 2008089094A
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pipe
water
conduit
ground
liquefaction
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Kenichiro Watanabe
賢一郎 渡邊
Shunji Azuma
俊司 東
Kazunari Kamagome
和成 鎌込
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a conduit liquefaction measure structure for preventing the liquefaction of a ground apart from a conduit. <P>SOLUTION: The conduit liquefaction measure structure is provided for preventing the flotation of a pipe body 2 and a manhole 3 connected to the pipe body 2 when a ground around the conduit 1 is liquefied. It comprises a communication hole 41 for communicating the inside of the conduit 1 provided in the shell of the pipe body 2 with the outside thereof, a water pipe 42 provided extending from the communication hole 41 to a ground under the conduit 1, and a filter material 43 for preventing the passage of sediment inside the water pipe 42. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、地震によって液状化するおそれのある地盤に構築される管路の浮上を防止するための管路の液状化対策構造に関するものである。   The present invention relates to a pipe liquefaction countermeasure structure for preventing the rise of a pipe constructed on the ground that may be liquefied by an earthquake.

従来、地震によって液状化した地盤内で発生する過剰間隙水圧によって、人孔(マンホール)が浮上することを防止するための浮上防止構造が知られている(特許文献1)。   2. Description of the Related Art Conventionally, a floating prevention structure for preventing a manhole from rising due to excessive pore water pressure generated in ground liquefied by an earthquake is known (Patent Document 1).

この特許文献1に開示されたマンホールは、側壁及び底版に逆止弁を備えた貫通孔が設けられており、地震によってマンホールの周辺地盤の間隙水圧が上昇すると、その貫通孔を通ってマンホール内部に間隙水が流れ込み、過剰間隙水圧の発生を抑えることができる。
特開2006−124966号公報
The manhole disclosed in Patent Document 1 is provided with through holes provided with check valves on the side walls and the bottom plate, and when the pore water pressure in the ground around the manhole rises due to an earthquake, the manhole is passed through the through holes. It is possible to suppress the generation of excessive pore water pressure by the pore water flowing into the water.
JP 2006-124966 A

しかしながら、上記した従来の浮上防止構造では、マンホールに隣接する地盤が液状化した際には過剰間隙水圧の発生を抑えることができるが、マンホールに接していない地盤が液状化した場合には液状化対策構造としての効果を発揮することができないおそれがある。   However, the conventional anti-floating structure described above can suppress the generation of excessive pore water pressure when the ground adjacent to the manhole is liquefied, but it is liquefied when the ground not in contact with the manhole is liquefied. There is a possibility that the effect as a countermeasure structure cannot be exhibited.

すなわち、マンホールを設置した際の埋戻し材としてセメントベントナイトなどの固化材をその周囲に充填する場合があるが、このような固化材は透水係数が低く、その固化材の周囲の地盤が液状化しても固化材を通して貫通孔に瞬時に過剰間隙水圧を逃がすことが難しい。その結果、埋め戻しのために充填された固化材ごとマンホールが浮上してしまうおそれがある。   In other words, solidification materials such as cement bentonite may be filled around the manhole as a backfill material, but such solidification materials have a low hydraulic conductivity, and the ground around the solidification material liquefies. Even so, it is difficult to instantaneously release excess pore water pressure through the solidified material to the through hole. As a result, the manhole may rise together with the solidified material filled for backfilling.

そこで、本発明は、管路から離れた地盤の液状化を防ぐことが可能な管路の液状化対策構造を提供することを目的としている。   Therefore, an object of the present invention is to provide a liquefaction countermeasure structure for a pipeline that can prevent liquefaction of the ground away from the pipeline.

前記目的を達成するために、本発明の管路の液状化対策構造は、管路周辺の地盤が液状化した際に管体及びその管体に接続される人孔の少なくとも一方の浮上を防止する管路の液状化対策構造であって、前記管体及び前記人孔の少なくとも一方の外殻に設けられる管路の内外を連通させる連通孔と、その連通孔から前記管路の下方地盤に延設される通水管と、その通水管内部の土砂の通過を阻止するフィルター材とを備えたことを特徴とする。   In order to achieve the above object, the liquefaction countermeasure structure for a pipe of the present invention prevents the floating of at least one of a pipe and a human hole connected to the pipe when the ground around the pipe is liquefied. A liquefaction countermeasure structure for a pipe line, a communication hole that communicates the inside and outside of the pipe line provided in at least one outer shell of the pipe body and the human hole, and the communication hole from the communication hole to a lower ground of the pipe line It is characterized by comprising a water pipe that is extended and a filter material that prevents passage of earth and sand inside the water pipe.

ここで、前記通水管の前記管路内部側の端部に逆止弁を設けるのが好ましい。   Here, it is preferable that a check valve is provided at an end portion of the water conduit on the inner side of the conduit.

また、前記通水管の側面に複数の開孔部を形成することができる。   A plurality of apertures can be formed on the side surface of the water pipe.

このように構成された本発明の管路の液状化対策構造は、管路の外殻に内外を連通させる連通孔が設けられるとともに、その連通孔から管路の下方地盤に延設される通水管を備えている。   The pipe liquefaction countermeasure structure of the present invention thus configured is provided with a communication hole that communicates the inside and the outside with the outer shell of the pipe, and the communication hole that extends from the communication hole to the lower ground of the pipe. It has a water pipe.

そして、管路の下方地盤の間隙水圧が上昇すると、その通水管を通って間隙水が管路内に流れ込み、過剰間隙水圧の発生が抑えられる。   Then, when the pore water pressure in the ground below the pipeline rises, the pore water flows into the pipeline through the water conduit, and the generation of excessive pore water pressure is suppressed.

このため、管路から離れた地盤が液状化する可能性が高いものであっても、液状化の発生を防ぐことができる。   For this reason, generation | occurrence | production of liquefaction can be prevented even if the ground apart from the pipe line is highly likely to liquefy.

また、通水管の内部に砕石などのフィルター材を充填するなどしておくことで、間隙水と一緒に砂などが管路内に流入することを防ぐことができる。   Further, by filling the inside of the water pipe with a filter material such as crushed stone, sand and the like can be prevented from flowing into the pipe along with the pore water.

さらに、通水管の管路内部側の端部に逆止弁を設けることで、管路内を流れる水の地盤への漏水を防ぐことができる。   Furthermore, by providing a check valve at the end of the water conduit inside the conduit, leakage of water flowing through the conduit to the ground can be prevented.

そして、通水管の側面に複数の開孔部を設けることで、管路の下方地盤の液状化を広い範囲で防ぐことができる。   And the liquefaction of the lower ground of a pipe line can be prevented in a wide range by providing a some opening part in the side surface of a water flow pipe.

以下、本発明の最良の実施の形態について図面を参照して説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図1は、本実施の形態の管路1の液状化対策構造の構成を示した図である。   FIG. 1 is a diagram showing a configuration of a liquefaction countermeasure structure for a pipeline 1 according to the present embodiment.

まず、構成から説明すると、この管路1は、水を流下させる管体2と、その管体2に略直交して地表に連通する人孔3とから主に構成される。   First, in terms of configuration, the pipe line 1 is mainly composed of a pipe body 2 that allows water to flow down and a human hole 3 that is substantially orthogonal to the pipe body 2 and communicates with the ground surface.

この管体2は、農業用送水管、下水道管等として使用される筒状物であり、受口部と挿口部とを備えた単位長さの管を複数繋いで形成する。   This tubular body 2 is a cylindrical object used as an agricultural water supply pipe, a sewer pipe, and the like, and is formed by connecting a plurality of unit length pipes each having a receiving part and an insertion part.

この管体1には、例えば繊維強化プラスチックモルタル(FRPM)管などが使用できる。   For example, a fiber reinforced plastic mortar (FRPM) pipe can be used for the pipe body 1.

このFRPM管から構成される管体2は、2層の繊維強化プラスチック(FRP)層である内面FRP層と外面FRP層との間に樹脂モルタル層を介在させて一体化したものである。   The pipe body 2 composed of this FRPM pipe is formed by integrating a resin mortar layer between an inner surface FRP layer and an outer surface FRP layer which are two fiber reinforced plastic (FRP) layers.

この内面FRP層と外面FRP層は、繊維方向を円周方向や管軸方向に向けた複数のガラス繊維層を積層させるとともに、不飽和ポリエステルを含浸させて形成したものである。   The inner surface FRP layer and the outer surface FRP layer are formed by laminating a plurality of glass fiber layers whose fiber directions are in the circumferential direction or the tube axis direction and impregnating with unsaturated polyester.

また、樹脂モルタル層は、硅砂などの無機質と不飽和ポリエステル樹脂とによって構成されて、内面FRP層及び外面FRP層と一体化されている。   The resin mortar layer is made of an inorganic material such as cinnabar and an unsaturated polyester resin, and is integrated with the inner surface FRP layer and the outer surface FRP layer.

一方、人孔3は、管体2に所定の間隔毎に形成されるマンホールで、管路1の維持・管理などの目的で管体2の内部に入る際に使用される。   On the other hand, the human hole 3 is a manhole formed in the tubular body 2 at predetermined intervals, and is used when entering the inside of the tubular body 2 for the purpose of maintaining and managing the conduit 1.

図1には、管体2の上面に人孔3を立設させる構造を示したが、これに限定されるものではなく、人孔3の側面に管体2を接続する構造であってもよい。   Although FIG. 1 shows a structure in which the human hole 3 is erected on the upper surface of the tube body 2, the present invention is not limited to this. Good.

そして、本実施の形態の管路1の液状化対策構造では、管体2及び人孔3の少なくとも一方の外殻に、管路1の内外を連通させる連通孔41を設ける。   And in the liquefaction countermeasure structure of the pipe line 1 of this Embodiment, the communicating hole 41 which connects the inside and outside of the pipe line 1 is provided in the outer shell of at least one of the pipe body 2 and the human hole 3.

すなわち、図1では、人孔3の下方に位置する管体2の下部側面に、人孔3を挟んで2つの連通孔41,41を設けている。この連通孔41には、予め管体2に設けられたグラウト注入用のグラウトホールなどが利用できる。   That is, in FIG. 1, two communication holes 41, 41 are provided on the lower side surface of the tubular body 2 located below the human hole 3 with the human hole 3 interposed therebetween. For the communication hole 41, a grout hole for grout injection provided in the tube 2 in advance can be used.

また、図1の管路1の周りは、管路1を設置する際に溝状に掘削された掘削溝に充填された埋戻材51である。この埋戻材51には、掘削時の孔壁保護に使用されるベントナイトなどの安定液にセメントを添加して固化させるセメントベントナイトや、乾式掘削をおこなった場合の埋戻土などが該当する。   1 is a backfill material 51 filled in excavation grooves excavated in a groove shape when the conduit 1 is installed. The backfill material 51 corresponds to cement bentonite in which cement is added to a stabilizing liquid such as bentonite used for protecting hole walls during excavation and solidified, and backfill soil in the case of dry excavation.

そして、この埋戻材51の下方地盤には、ゆるい飽和砂地盤などの液状化層52が存在していることとする。   Then, it is assumed that a liquefied layer 52 such as a loose saturated sand ground exists on the lower ground of the backfill material 51.

本実施の形態では、管体2の下部側面に設けた連通孔41,41からこの液状化層52に向けて、通水管42,42をそれぞれ垂下させている。   In the present embodiment, the water pipes 42 and 42 are suspended from the communication holes 41 and 41 provided on the lower side surface of the pipe body 2 toward the liquefied layer 52.

この通水管42は、塩化ビニル管や鋼管などを管体2内部から地盤に向けて挿入することによって、管路1の下方地盤に配置することができる。   The water pipe 42 can be arranged on the lower ground of the pipe line 1 by inserting a vinyl chloride pipe, a steel pipe or the like from the inside of the pipe body 2 toward the ground.

また、この通水管42の管路内部側の端部には、図2(a)に示すように逆止弁44を設ける。この逆止弁44は、管体2内部を流れる流体の圧力によって閉じ、その圧力よりも通水管42内部の水圧が大きくなった場合に開くように構成されている。   Further, as shown in FIG. 2A, a check valve 44 is provided at the end of the water conduit 42 on the inner side of the conduit. The check valve 44 is configured to be closed by the pressure of the fluid flowing inside the tube body 2 and to be opened when the water pressure inside the water flow pipe 42 becomes larger than the pressure.

例えば、図2(a)では、管内水位6Aよりも下に連通孔41が位置して水没している状態を示しているが、通常時はこの管内水位6Aによる水圧によって逆止弁44が閉じているので、管体2内の水が通水管42を通って地盤に流れ出すことがない。   For example, FIG. 2A shows a state in which the communication hole 41 is located below the in-pipe water level 6A and is submerged. Normally, the check valve 44 is closed by the water pressure by the in-pipe water level 6A. Therefore, the water in the pipe body 2 does not flow out to the ground through the water pipe 42.

また、図2(b)には、逆止弁44とは異なる構成によって通水管42に管体2内の水が流れ込むのを防ぐ構造を示した。   FIG. 2B shows a structure that prevents the water in the pipe body 2 from flowing into the water conduit 42 by a configuration different from the check valve 44.

この構造では、連通孔41を管体2の上部側面に設け、管体2内部に連通孔41から人孔3に連絡される略L字形の内部管45を配管している。   In this structure, the communication hole 41 is provided on the upper side surface of the tube body 2, and a substantially L-shaped inner tube 45 connected to the human hole 3 from the communication hole 41 is provided inside the tube body 2.

この内部管45の上端は、管体2の通常時の管内水位6Bよりも上方に位置しているため、逆止弁44を設けなくても管体2内の水が通水管42に流れ込むことはない。   Since the upper end of the internal pipe 45 is located above the normal pipe water level 6B of the pipe body 2, the water in the pipe body 2 flows into the water pipe 42 without providing the check valve 44. There is no.

また、この通水管42の内部には、図1に示すように砕石などのフィルター材43を充填するなどして土砂の通過を阻止する。ここで、図3に2つの異なる形態の通水管42A,42Bの構成を示した。   Further, the passage of earth and sand is blocked by filling the inside of the water pipe 42 with a filter material 43 such as crushed stone as shown in FIG. Here, the structure of the water pipes 42A and 42B of two different forms was shown in FIG.

図3(a)に示した通水管42Aは、下端付近の内部に網蓋421が取り付けられており、その上に砕石などのフィルター材43を積層することで、フィルター材43の下方への流出を防ぐことができる。   The water pipe 42A shown in FIG. 3 (a) has a net lid 421 attached inside the vicinity of the lower end, and the filter material 43 such as crushed stone is laminated thereon, so that the filter material 43 flows downward. Can be prevented.

また、図3(b)に示した通水管42Bには、側面に複数の開孔部422,・・・が形成されており、液状化層52に開孔部422,・・・が埋設されるようにすることで、ここから液状化層52の間隙水を取り込むことができるようになる。   3 (b) has a plurality of apertures 422,... Formed in the side surface, and the apertures 422,... Are embedded in the liquefied layer 52. By doing so, pore water in the liquefied layer 52 can be taken in from here.

なお、この通水管42Bの下端にも網蓋421が取り付けられるとともに、内部に砕石などのフィルター材43が充填されている。   A net lid 421 is also attached to the lower end of the water conduit 42B, and a filter material 43 such as crushed stone is filled therein.

次に、本実施の形態の管路1の液状化対策構造の作用について説明する。   Next, the effect | action of the liquefaction countermeasure structure of the pipe line 1 of this Embodiment is demonstrated.

このように構成された本実施の形態の管路1の液状化対策構造は、管路1の外殻に内外を連通させる連通孔41が設けられるとともに、その連通孔41から管路1の下方地盤に延設される通水管42を備えている。   The liquefaction countermeasure structure of the pipe line 1 of the present embodiment configured as described above is provided with a communication hole 41 that communicates the inside and the outside with the outer shell of the pipe line 1 and from the communication hole 41 below the pipe line 1. A water pipe 42 extending to the ground is provided.

そして、管路1の下方の液状化層52の間隙水圧が地震によって伝達された振動によって上昇すると、その通水管42を通って圧力が上昇した間隙水が管路1内に流れ込み地盤内から排出されるので、液状化層52の過剰間隙水圧の発生が抑えられる。   Then, when the pore water pressure in the liquefied layer 52 below the pipe line 1 is increased by the vibration transmitted by the earthquake, the pore water whose pressure has increased through the water pipe 42 flows into the pipe line 1 and is discharged from the ground. Therefore, the generation of excess pore water pressure in the liquefied layer 52 is suppressed.

このため、管路1から離れた地盤が液状化する可能性が高いものであっても、液状化現象によって人孔3や管体2が浮上することを防ぐことができる。すなわち、液状化層52が埋戻材51やその他液状化し難い地盤を挟んで管路1から離れた位置にあったとしても、その液状化層52に通水管42の下端が埋設されるように延設することで、効果的に液状化の発生を抑えることができる。   For this reason, even if the ground away from the pipe line 1 is highly likely to be liquefied, it is possible to prevent the human hole 3 and the pipe body 2 from rising due to the liquefaction phenomenon. That is, even if the liquefied layer 52 is located away from the pipeline 1 with the backfill material 51 or other ground that is difficult to liquefy, the lower end of the water pipe 42 is embedded in the liquefied layer 52. By extending, generation | occurrence | production of liquefaction can be suppressed effectively.

また、通水管42の内部に砕石などのフィルター材43を充填しておくことで、間隙水と一緒に砂などが通水管42内を上昇するのが阻止されるので、管路1内に土砂が流入することを防ぐことができる。   Further, by filling the inside of the water conduit 42 with a filter material 43 such as crushed stone, sand and the like are prevented from rising in the water conduit 42 together with the pore water. Can be prevented from flowing in.

さらに、通水管42の管路1内部側の端部に逆止弁44を設けることで、管路1内を流れる水の地盤への漏水を防ぐことができる。   Furthermore, by providing the check valve 44 at the end of the water conduit 42 on the inner side of the pipe 1, it is possible to prevent leakage of water flowing through the pipe 1 to the ground.

そして、通水管42の側面に複数の開孔部422,・・・を設けることで、管路1の下方地盤の液状化を広い範囲で防ぐことができる。すなわち、液状化層52が厚く堆積している場合には、液状化層52に埋設される通水管42の深度方向の広範囲にわたって開孔部422,・・・を設け、広範囲で間隙水の取り込みができるようにしておけばよい。   And the liquefaction of the lower ground of the pipe line 1 can be prevented in a wide range by providing the several opening part 422 ... in the side surface of the water flow pipe 42. FIG. That is, when the liquefied layer 52 is deposited thickly, the opening portions 422,... Are provided over a wide range in the depth direction of the water flow pipe 42 embedded in the liquefied layer 52, and the pore water is taken in a wide range. You should be able to.

以下、この実施例では、前記実施の形態とは別の形態の管路71の液状化対策構造について、図4を参照しながら説明する。   In the following, in this example, a liquefaction countermeasure structure of the pipe 71 in a form different from the above embodiment will be described with reference to FIG.

前記実施の形態では、管体2の側面に通水管42を接続した例について説明したが、この実施例では、人孔73の下面に通水管742を接続する場合について説明する。   In the above-described embodiment, the example in which the water conduit 42 is connected to the side surface of the pipe body 2 has been described. In this embodiment, a case in which the water conduit 742 is connected to the lower surface of the human hole 73 will be described.

この人孔73は、鉄筋コンクリート製の本体部73aと、本体部73aと一体に成形される底版部73bと、コンクリート製のインバート部73cとから主に構成される。   The human hole 73 is mainly composed of a main body portion 73a made of reinforced concrete, a bottom plate portion 73b formed integrally with the main body portion 73a, and an invert portion 73c made of concrete.

この本体部73aは、地表に近い部分が先細りするボトル形に成形されるとともに、側壁下部に管体72を接続するための開口部が形成されている。   The main body 73a is formed into a bottle shape in which a portion close to the ground surface is tapered, and an opening for connecting the pipe body 72 is formed at the lower portion of the side wall.

また、底版部73bは、中央に穴が設けられた円環状部材であり、その穴と底版部73bの上面に打設するコンクリートによってインバート部73cが形成される。   The bottom plate portion 73b is an annular member having a hole in the center, and the inverted portion 73c is formed by the concrete cast on the hole and the top surface of the bottom plate portion 73b.

次に、この管路71の液状化対策構造の構築方法について説明する。   Next, a construction method of the liquefaction countermeasure structure for the pipe 71 will be described.

まず、地盤を溝状に図4の掘削線53に至るまで掘削する。この際、人孔73を設置する箇所は、管体72を設置する箇所より深く掘削し、その掘削底面には砕石を敷き均して砕石基礎部73dを構築する。   First, the ground is excavated in a groove shape until reaching the excavation line 53 of FIG. At this time, the place where the manhole 73 is installed is excavated deeper than the place where the pipe body 72 is installed, and crushed stone is spread on the bottom of the excavation to form the crushed stone foundation portion 73d.

そして、その砕石基礎部73dの上に、工場などで予め製作したプレキャストコンクリート製の人孔73の本体部73aを設置する。   And the main-body part 73a of the prehole-made concrete human hole 73 manufactured beforehand in the factory etc. is installed on the crushed stone foundation part 73d.

また、この本体部73aと一体に成形された底版部73bの所定の位置には、連通孔741,741が複数形成されているので、その連通孔741,741に人孔73の内部から通水管742,742をそれぞれ挿入する。   In addition, since a plurality of communication holes 741 and 741 are formed at predetermined positions of the bottom plate portion 73b formed integrally with the main body portion 73a, a water pipe is formed in the communication holes 741 and 741 from inside the human hole 73. 742 and 742 are inserted respectively.

この通水管742,742は、下端が液状化層52に埋設されるまで人孔73の下方地盤に向けて押し込まれるとともに、上端がインバート部73cの上面に露出する高さになるように配置される。   The water pipes 742 and 742 are arranged so that the lower end is pushed toward the lower ground of the human hole 73 until the lower end is embedded in the liquefied layer 52, and the upper end is exposed to a height exposed on the upper surface of the invert part 73c. The

そして、通水管742,742の上部が底版部73b上に突出した状態でコンクリートを打設し、インバート部73cを構築する。また、通水管742,742の上端には逆止弁744,744をそれぞれ設ける。   And concrete is cast in the state where the upper part of water pipes 742 and 742 protrudes on bottom slab part 73b, and invert part 73c is built. Further, check valves 744 and 744 are provided at the upper ends of the water pipes 742 and 742, respectively.

さらに、人孔73の側壁の開口部には管体72を接続し、管体72と人孔73の周囲に埋戻土などの埋戻材51を充填する。   Further, a tube body 72 is connected to the opening of the side wall of the human hole 73, and a backfill material 51 such as backfill soil is filled around the tube body 72 and the human hole 73.

このように人孔73の直下に通水管742,742を延設することで、人孔73の下方地盤の液状化の発生を極力抑えて、地震時の人孔73の浮上を効果的に防止することができる。   In this way, by extending the water pipes 742 and 742 directly under the human hole 73, the occurrence of liquefaction of the ground below the human hole 73 is suppressed as much as possible, and the floating of the human hole 73 during the earthquake is effectively prevented. can do.

なお、他の構成及び作用効果については、前記実施の形態と略同様であるので説明を省略する。   Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

以上、図面を参照して、本発明の最良の実施の形態を詳述してきたが、具体的な構成は、この実施の形態または実施例に限らず、本発明の要旨を逸脱しない程度の設計的変更は、本発明に含まれる。   Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment or example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

例えば、前記実施の形態では、円筒状のFRPM管を管体2として使用したが、これに限定されるものではなく、FRP管、鋼管、コンクリート管などいずれの材質及びいずれの形状の管体であっても本発明に適用することができる。   For example, in the above-described embodiment, a cylindrical FRPM pipe is used as the pipe body 2. However, the present invention is not limited to this, and any material and any shape pipe body such as an FRP pipe, a steel pipe, or a concrete pipe may be used. Even if it exists, it is applicable to this invention.

また、前記実施の形態及び実施例では、通水管42,742を鉛直下向に向けて延設させたが、これに限定されるものではなく、斜め下方に広がるように延設させて広範囲の液状化層52の液状化を防止したり、人孔3両側の管体2から斜め下方に先細りするように延設させて人孔3直下の地盤の液状化を集中的に防いだりすることができる。   Moreover, in the said embodiment and Example, although the water flow pipes 42 and 742 were extended vertically downward, it is not limited to this, It is extended and extended so that it may spread diagonally downward, and it is a wide range. It is possible to prevent liquefaction of the liquefied layer 52, or to extend the taper obliquely downward from the pipe body 2 on both sides of the human hole 3 to intensively prevent liquefaction of the ground directly under the human hole 3. it can.

さらに、前記実施の形態及び実施例では、新設の管路1,71に通水管42,742を設ける場合について説明したが、これに限定されるものではなく、既設の管路に通水管を後から取り付けて液状化対策構造とすることもできる。   Further, in the embodiment and the example described above, the case where the water pipes 42 and 742 are provided in the newly installed pipe lines 1 and 71 is described, but the present invention is not limited to this, and the water pipes are provided in the existing pipe lines. It can also be attached to make a liquefaction countermeasure structure.

また、前記実施の形態及び実施例では、人孔3,73の周囲の液状化対策構造について説明したが、これに限定されるものではなく、管体2だけが配設された範囲であっても本発明を適用することができる。   Moreover, in the said embodiment and Example, although the liquefaction countermeasure structure around the human hole 3 and 73 was demonstrated, it is not limited to this, It is the range in which only the tubular body 2 was arrange | positioned. The present invention can also be applied.

さらに、前記実施の形態では、砕石をフィルター材43として通水管42の内部に充填した場合について説明したが、これに限定されるものではなく、砂が通過できないような目の細かい網蓋などをフィルター材として通水管42に取り付けてもよい。   Furthermore, in the said embodiment, although the case where the crushed stone was filled in the inside of the water flow pipe 42 as the filter material 43 was demonstrated, it is not limited to this, A fine mesh cover etc. which cannot pass sand etc. You may attach to the water flow pipe 42 as a filter material.

本発明の最良の実施の形態の管路の液状化対策構造の構成を説明する説明図である。It is explanatory drawing explaining the structure of the liquefaction countermeasure structure of the pipe line of the best embodiment of this invention. (a)は管体の下部側面に連通孔を開けて通水管の上端に逆止弁を設けた構成を説明する断面図、(b)は管体の上部側面に連通孔を開けて通水管の上端を人孔の内部まで延設した構成を説明する断面図である。(A) is sectional drawing explaining the structure which opened the communicating hole in the lower side surface of a pipe body, and provided the check valve in the upper end of a water pipe, (b) opened a communicating hole in the upper side surface of a pipe body, and a water pipe It is sectional drawing explaining the structure which extended the upper end of to the inside of a human hole. (a)は通水管の下端の構成を説明する一部切断側面図、(b)は通水管の側面に開孔部を設けた構成を説明する一部切断側面図である。(A) is a partially cut side view for explaining the configuration of the lower end of the water pipe, and (b) is a partially cut side view for explaining a structure in which an opening is provided on the side surface of the water pipe. 実施例の管路の液状化対策構造の構成を説明する説明図である。It is explanatory drawing explaining the structure of the liquefaction countermeasure structure of the pipe line of an Example.

符号の説明Explanation of symbols

1 管路
2 管体
3 人孔
41 連通孔
42 通水管
422 開孔部
43 フィルター材
44 逆止弁
52 液状化層(下方地盤)
71 管路
72 管体
73 人孔
741 連通孔
742 通水管
744 逆止弁
DESCRIPTION OF SYMBOLS 1 Pipe line 2 Tubing body 3 Human hole 41 Communication hole 42 Water communication pipe 422 Opening part 43 Filter material 44 Check valve 52 Liquefaction layer (lower ground)
71 Pipe 72 Pipe 73 Human hole 741 Communication hole 742 Water pipe 744 Check valve

Claims (3)

管路周辺の地盤が液状化した際に管体及びその管体に接続される人孔の少なくとも一方の浮上を防止する管路の液状化対策構造であって、
前記管体及び前記人孔の少なくとも一方の外殻に設けられる管路の内外を連通させる連通孔と、その連通孔から前記管路の下方地盤に延設される通水管と、その通水管内部の土砂の通過を阻止するフィルター材とを備えたことを特徴とする管路の液状化対策構造。
A liquefaction countermeasure structure for a pipe line that prevents at least one of the pipe body and a human hole connected to the pipe body when the ground around the pipe line has liquefied,
A communication hole that communicates the inside and outside of a pipe line that is provided in at least one outer shell of the pipe body and the human hole, a water pipe that extends from the communication hole to a lower ground of the pipe line, and the inside of the water pipe A liquefaction countermeasure structure for a pipeline characterized by comprising a filter material that prevents the passage of earth and sand.
前記通水管の前記管路内部側の端部に逆止弁を設けたことを特徴とする請求項1に記載の管路の液状化対策構造。   The liquefaction countermeasure structure for a pipe according to claim 1, wherein a check valve is provided at an end of the water pipe inside the pipe. 前記通水管の側面に複数の開孔部が形成されていることを特徴とする請求項1又は2に記載の管路の液状化対策構造。
The liquefaction countermeasure structure for a pipe line according to claim 1 or 2, wherein a plurality of apertures are formed on a side surface of the water pipe.
JP2006271343A 2006-10-03 2006-10-03 Conduit liquefaction measure structure Withdrawn JP2008089094A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012225123A (en) * 2011-04-22 2012-11-15 Kansai Electric Power Co Inc:The Drainage system for underground structure
JP5564676B1 (en) * 2014-02-17 2014-07-30 強化土株式会社 Liquefaction suppression device and liquefaction suppression method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012225123A (en) * 2011-04-22 2012-11-15 Kansai Electric Power Co Inc:The Drainage system for underground structure
JP5564676B1 (en) * 2014-02-17 2014-07-30 強化土株式会社 Liquefaction suppression device and liquefaction suppression method

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